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Audited Supplier The distribution network automation feeder terminal is a distribution network automation terminal product developed mainly for pole-mounted switches (load switches/circuit breakers) in 10kV distribution networks. It adopts imported high-speed sampling chips and 32-bit high-speed processor control chips, which can be completed quickly and stably. The monitoring of high-voltage switches has the characteristics of high integration, flexible configuration, and friendly interface.
Installed on the 10kV feeder loop pole of the distribution network, it forms a complete set of equipment with outdoor pole-mounted switches and voltage transformers. It has functions such as remote signaling, telemetry, remote control, fault detection, protection, and historical data storage, and is integrated with the distribution network automation main station. Communication provides the operation status and various parameters of the distribution network system, including switch status, power parameters, etc., and executes the commands issued by the distribution network master station to adjust and control the power distribution equipment. The components of this complete set of equipment are electrically connected with outdoor protective control cables and aviation connectors, and are designed for outdoor maintenance-free operation.
It is widely used in radial power supply and ring network power supply systems. It can cooperate with the main station according to the set technical parameters to help the system identify transient faults and permanent faults of the line. It can automatically eliminate the impact of transient faults on the line, and can also cooperate with the main station. It cooperates with the station to isolate the permanent fault section, avoid causing long-term large-area power outages, and automatically restore the power supply to the grid in non-faulty sections, thereby realizing distribution network automation in an economical and practical manner. It is an excellent supporting model for various types of pole-mounted switches.
"Three-Remote" feeder automation terminal uses a high-performance 32-bit microprocessor as the hardware development platform and efficient embedded real-time operation as the software development platform. It has the following distinctive technical features:
Platform: Unified embedded software and hardware combination platform (CPU adopts self-developed 32-bit motherboard, main frequency can reach 240MHZ hardware platform with large information processing capacity and embedded multi-task real-time operating system software platform), supports high-speed Ethernet bus And CAN bus, the interface capacity is large.
Storage: Large-capacity FALSH and RAM, which can record location, accident remote signal displacement SOE and other event sequence records, and extreme value record data are stored locally for a period of not less than 1 month, and support the supplementary upload of historical data.
Hardware configuration: independent communication management module, hardware configuration supports active and standby interchange, redundant design.
Software configuration: supports multiple communication methods and multiple communication protocols, and can communicate with multiple master stations of different levels at the same time.
a, Real-time monitoring of power supply, AC power loss and battery under-voltage alarms
e, supports access to lead-acid batteries and lithium batteries
Provides remote and local maintenance interfaces, and operators can maintain it locally or remotely such as the main station.
Adaptable to harsh environments, working temperature -40ºC~+70ºC, anti-magnetic, shockproof and moisture-proof. Electromagnetic compatibility can reach level 4 and above requirements, and can adapt to strong electromagnetic environments.
1. Remote Control, Telemetry and Remote Signaling Functions
1.1 Remote control function.
Normal remote control tripping and closing is possible:
a. The terminal accepts and executes remote control commands from the main station or substation to complete the opening and closing operations of the switch.
b. With remote/local transfer switch: the transfer switch control authority can realize the opening and closing operations of the switch locally.
c. Record and save the main station and local remote control records respectively.
d. Software and hardware anti-misoperation measures are taken to ensure the reliability of control operations.
e. The remote control contact can set the action holding time.
Remote control process:
a. After the terminal receives the remote control preset command issued by the master station, the terminal verifies the correctness of the remote control command.
b. When the remote control command is correct, the terminal closes the controlled object relay and detects whether the object relay operates correctly.
c. After the target relay operates correctly, the terminal sends a remote control correct return-to-school response to the master station.
d. After receiving the correct return-to-school response from the remote control, the master station issues a remote control execution or remote control cancellation command.
e. After receiving the remote control execution command, the terminal closes the execution relay. After the set remote control duration, it disconnects the execution relay and the object relay, and at the same time disconnects the output relay power.
Remote control protection measures:
a. Software protection: It will only act after receiving the correct remote control preset command and remote control execution command.
b. The outlet relay does not have working power supply at ordinary times and is powered on only after receiving the remote control preset command.
c. The control locking combined with software and hardware ensures that the control cannot be exported when the terminal is not operating normally.
d. The hardware of the target relay is recalibrated to ensure that the control does not act when the target relay malfunctions.
e. There are control outlets only when the power control relay, object relay, and relay sequence action are executed, which increases the reliability of control.
1.2 Telemetry function.
Remote measurement collection: including Uab, Ubc, Ia, Ib, Ic and other analog quantities. Collect DC quantities such as battery voltage, harmonic components of current and voltage, etc.
After the remote measurement converts the voltage/current on the primary side into the corresponding weak voltage signal through PT/CT, it enters the 14-bit A/D conversion chip. The on-site standard secondary voltage and current (5A or 1A) are passed through the high-precision small PT, The CT is isolated and converted into a weak signal, which is sent to the processing module through the analog-to-digital converter (A/D) for calculation and processing.
The following telemetry measurements are calculated:
a, frequency.
b, Current and voltage phases.
c, 2nd to 13th harmonics of current and voltage.
1.3 Remote signaling function.
Remote signal quantity (YX) collection: Collect remote signal displacement, accident remote signal and send status quantity to the main station or sub-station. The remote signaling input signal passes through the photoelectric isolator in the form of an empty contact and then is sent to the remote signaling acquisition module for processing. After hardware filtering and software filtering, the opening and closing status of the remote signaling input signal is obtained.
The software filtering time can be set to ensure stable remote signaling action before remote signaling displacement occurs and reduce false alarms of remote signaling.
a. Collect the closing and opening state quantity information of the switch.
b. Collect terminal power status information.
c. Collect virtual remote messages such as terminal faults and abnormal information.
d. Virtual remote signaling such as telemetry over-limit, over-current, grounding, etc.
e, Collect the switch energy storage status.
2. Parameter Setting Function
The terminal has parameter remote setting function and local setting function, and has the following instructions and setting content:
a. Receive parameter settings and setting modifications from the master station or substation. The substation or master station can call the current setting of the terminal at any time.
b. It has controller operating status and communication status indicator lights.
c. It has a fault alarm indicator light, and the alarm indication can be eliminated by pressing the reset button.
3. Power Loss Protection Function
When the terminal power fails, the real-time information of the terminal is saved in the internal power-down protected memory (SRAM).
4. Time Synchronization Function
The terminal has the master station and its own timekeeping function. The terminal can be time-synchronized through the maintenance software or the master station time-synchronization command.
5. Self-Diagnosis Function
Equipped with self-diagnosis function. The device performs regular self-tests during normal operation. The objects of self-test include CPU, set value, output loop, sampling channel, E²PROM and other parts. When the self-check is abnormal, an alarm report is issued, the alarm indicator light is illuminated, and the opening and closing circuits are blocked.
6. Fault Detection
6.1 Fault detection function
a, Zero sequence overcurrent detection.
b. Line two-phase overcurrent detection.
6.2 Fault identification function
Based on the collected current size and the set fixed value, the terminal can identify the fault current, quickly calculate the fault current size, make comparisons, and actively report the fault information and nature to the master station or substation (status changes are transmitted first) for further processing. Fault isolation.
6.3 Protection principle
a. Zero-sequence overcurrent detection: When the line zero-sequence current exceeds a fixed value, a zero-sequence overcurrent alarm is generated and reported to the master station. The master station determines the protection plan and lights the fault alarm light at the same time.
b. Phase-to-phase overcurrent detection: When the phase-to-phase overcurrent of the line exceeds the set value, a phase-to-phase overcurrent alarm is generated and reported to the master station, which determines the protection plan and lights the fault alarm light at the same time.
c. Phase-to-phase short circuit detection: When the line is short-circuited between phases, a phase-to-phase quick-break alarm is generated and reported to the master station, which determines the protection plan and lights the fault alarm light at the same time.
7. Communication Function
The supporting GPRS communication module communicates with the main station or the mobile phones of relevant personnel. It has the functions of telemetry, remote signaling, and remote control, and can detect and transmit data information such as switch status, terminal working status, power supply status on both sides of the line, line voltage, line current, etc.
Communication configuration includes Ethernet port and serial communication port:
a, Basic configuration is 1 Ethernet port, supporting 10/100BASE-T adaptive Ethernet network communication.
b, 1 GPRS communication device.
c. The basic configuration is 1 maintenance port and 1 serial communication port, supporting RS-470/RS-232 communication.
Supports multiple types of communication methods:
a, Support fiber-based network communication methods.
b. Support power carrier communication mode.
c. Support wireless communication (GPRS/CDMA).
Supports flexible configuration of multiple protocols of communication ports:
a. Multiple communication ports enable communication with multiple master stations and sub-stations.
b. Supports IEC608-70-5-101 (2002 edition), IEC60870-5-104 and other communication protocols to communicate with the main station and sub-stations.
The above parameters are typical data; if the existing styles do not meet your specific demands, please contact us for a custom design.We have significant personalized customization development and production skills, allowing us to provide tailored solutions to customers all over the world.
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